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ID = 11979
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Photocell Gas filled 
Identical to 920
First Source (s)
20.Dec.1938 : -- Original-techn. papers.


Spectral response: S-1. Twin phototube for sound reproduction. Side-on type. Wavelength of maximum spectral response is 8000 +/- 1000 angstromes. This type makes use of a quarter-cylindrical photocathode. Anode-Supply voltage is 90 volts.


Dimensions (WHD)
incl. pins / tip
30 x 102 x mm / 1.18 x 4.02 x inch
Weight 31 g / 1.09 oz
Tube prices 2 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   RCA Phototubes and Photocells PT-60
  920: RCA Phototubes 1941
David Erali
920: RMG
Robert Gillespie

920: elektron taschenbuch 1952
Heinz Höger

920: RCA
Patrice Zeissloff

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